Patent US4152471A successfully refreshed from Google Patents.
US4152471A
Expired / Lapsed
US
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Method for continuously contact-coating one side only of a ferrous base metal strip with a molten coating metal
Assignee: Armco Inc
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Filing: 1977-09-19
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Granted: 1979-05-01
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Expires: 1997-09-19
Abstract
Abstract Method and means for continuously contact-coating one side only of a ferrous base metal strip with a molten coating metal. One or more roll means are provided to conduct the strip surface to be coated above the surface of a bath of the molten coating metal. The strip surface to be coated is caused to travel sufficiently close to the molten coating metal bath surface that the surface tension and wetting characteristics of the coating metal will permit the formation of a meniscus which will continuously contact and coat the strip surface. The coating is subjected to jet finishing. The strip is maintained in a protective non-oxidizing atmosphere at least until the one side thereof is coated. Alternatively, at least that side of the strip to be coated with the molten coating metal is coated with a flux which remains on the strip until contacted by the coating metal meniscus. The strip may be maintained in the protective non-oxidizing atmosphere until it is sufficiently cooled to prevent the formation of a visible oxide on the uncoated side thereof. When the strip is exposed to an oxidizing atmosphere after coating and while still sufficiently hot to form a visible oxide coating on the uncoated side thereof, the strip will thereafter be subjected to acid cleaning, rinsing and drying operations.
Inventors
- 👤 Paul E. Schnedler
- 👤 Marvin B. Pierson
- 👤 Hart F. Graff
- 👤 Thomas A. Compton
- 👤 William R. Leasure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:00
CPC Classifications
B; B05; B05C; B05C9/00; B05C9/02; C; C23; C23C; C23C2/00; C23C2/003; C23C2/0035; C23C2/0038; C23C2/004; C23C2/006; C23C2/0062; Y; Y10; Y10S; Y10S118/00; Y10S118/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
189 words
In a process of producing a ferrous base metal strip having coating metal on one side only, the other side of said strip remaining free of said coating metal, said ferrous base metal strip having been subjected to chemical preparation including the application of a flux to at least said one side thereof and having been treated to bring the ferrous base metal strip to a coating temperature sufficiently high to prevent casting of said coating metal thereon and low enough to prevent excess coating metal-base metal alloying, the improvement comprising the steps of providing a coating pot containing a molten bath of said coating metal, conducting said strip to a position above the upper surface of said bath with said one side of said strip facing said bath such that the surface tension and wetting characteristics of said molten coating metal will permit the formation of a meniscus at said upper surface of said bath contacting said one side of said strip, forming said meniscus, maintaining said meniscus and continuously contact coating said one side only of said strip therewith and finishing said coating said of said strip.
Claim 2
Dependent Claim
189 words
In a process of producing a ferrous base metal strip having coating metal on one side only, the other side of said strip remaining free of said coating metal, said ferrous base metal strip having been subjected to chemical preparation including the application of a flux to at least said one side thereof and having been treated to bring the ferrous base metal strip to a coating temperature sufficiently high to prevent casting of said coating metal thereon and low enough to prevent excess coating metal-base metal alloying, the improvement comprising the steps of providing a coating pot containing a molten bath of said coating metal, conducting said strip to a position above the upper surface of said bath with said one side of said strip facing said bath such that the surface tension and wetting characteristics of said molten coating metal will permit the formation of a meniscus at said upper surface of said bath contacting said one side of said strip, forming said meniscus, maintaining said meniscus and continuously contact coating said one side only of said strip therewith and finishing said coating said of said strip.
Claim 3
Dependent Claim
28 words
The process claimed in claim 1 wherein said molten coating is metal is chosen from the class consisting of zinc, zinc alloys, aluminum, aluminum alloys and lead alloys.
Claim 4
Dependent Claim
48 words
The process claimed in claim 1 including the steps of utilizing a single roll to conduct said strip to said meniscus forming position with respect to said bath surface and utilizing said single roll to conduct said coated strip away from said bath surface after said one-side coating.
Claim 5
Dependent Claim
38 words
The process claimed in claim 1 including the steps of providing first and second rolls in parallel spaced relationship, causing said strip to pass thereabout, forming said meniscus against said strip at the flight thereof between said rolls.
Claim 6
Dependent Claim
20 words
The process claimed in claim 4 including the step of depressing said strip flight toward said molten coating metal bath.
Claim 7
Dependent Claim
40 words
The process claimed in claim 1 including the steps of coating said strip in the ambient atmosphere, jet finishing said coated side of said strip with air in said ambient atmosphere and subjecting said one-side coated strip to acid cleaning.
Claim 8
Dependent Claim
64 words
The process claimed in claim 6 including the steps of providing a dilute acid bath for said acid cleaning step, conducting said one-side coated and finished strip through said bath, providing an electrode of sacrificial metal adjacent said uncoated strip side within said acid bath and electrically connecting said electrode and said strip whereby to remove said oxide film from said uncoated strip side.
Claim 9
Dependent Claim
56 words
The process claimed in claim 6 including the steps of providing a dilute acid bath for said acid cleaning step, conducting said one-side coated and finished strip through said bath, providing an electrode adjacent said uncoated strip side within said bath and providing means to connect said strip and said electrode across a source of current.
Claim 10
Dependent Claim
15 words
The process claimed in claim 8 wherein said source of current is an A.C. source.
Claim 11
Dependent Claim
15 words
The process claimed in claim 8 wherein said source of current is a D.C. source.
Claim 12
Dependent Claim
39 words
The process claimed in claim 8 including the step of providing an electrode in said molten coating metal bath, connecting said last mentioned electrode to said source of current whereby to connect said strip to said source of current.
Claim 13
Dependent Claim
31 words
The process claimed in claim 8 wherein said molten coating pot is metallic, connecting said pot to said source of current whereby to connect said strip to said source of current.
Claim 14
Dependent Claim
69 words
The process claimed in claim 6 including the step of causing said uncoated side of said one-side coated and finished strip to pass in contact with a sponge containing a dilute acid solution, providing means to connect said strip and said sponge across a source of electric current and continuously supplying said dilute acid solution to said sponge whereby to remove said oxide film from said uncoated strip side.
Claim 15
Dependent Claim
48 words
The process claimed in claim 1 including the step of maintaining said ferrous base metal strip in a protective atmosphere throughout said coating and finishing steps and until said strip has cooled to a temperature such that an oxide film will not form on said uncoated side thereof.
Claim 16
Dependent Claim
44 words
The process claimed in claim 14 including the step of causing said one-side coated and finished strip to pass about chilled rolls to accelerate the cooling of said strip to a temperature at which an oxide film will not form on said uncoated side.
Claim 17
Dependent Claim
45 words
The process claimed in claim 14 including the step of blowing a cooled protective, non-oxidizing gas against said one-side coated and finished strip to accelerate the cooling of said strip to a temperature at which an oxide film will not form on said uncoated side.
Claim 18
Dependent Claim
44 words
The process claimed in claim 1 including the steps of maintaining said ferrous base metal strip in a protective atmosphere throughout said coating and finishing steps and subjecting said one-side coated strip to a water quench prior to introducing it into the ambient atmosphere.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |